Image copyrightUniversity of Leicester Image caption
Scientists compared the DNA of the 1930 murder victim to that of the family of William Thomas Briggs

A family who feared for more than 80 years that their relative was murdered have been told by scientists the victim's DNA does not match theirs.

The victim of the "blazing car murder" has remained a mystery since 1930, when Alfred Rouse burned a man to death in his Morris Minor in Northamptonshire.

The family of William Thomas Briggs had believed he may have died in the car.

The University of Leicester found the victim's DNA on archived material. It did not match that of the family.

However, the team said they were still hopeful of a breakthrough and believe the "fantastic" find of a single, uncontaminated DNA profile on a 1930 microscope slide could lead to success in other unsolved cases.

Doctor's appointment

Philanderer Rouse, 36, attempted to fake his own death by hitting a man over the head, placing him in his car and setting it alight.

He chose the village of Hardingstone, near Northampton, in the early hours of 6 November, 1930 - a night when he believed a large fire would go unnoticed.

But two witnesses saw him running away from the blaze, a leather case in hand, and went to investigate.

Rouse was hanged at Bedford Jail, taking the identity of the unknown man to the grave.

Image copyrightUniversity of LeicesterImage caption
The family of William Thomas Briggs, including Samantha Hall (second left), hoped to find an answer

Image copyrightuniversity of leicesterImage caption
The mallet Alfred Rouse used on his victim is still held in the Northamptonshire Police archive

Image copyrightUniversity of LeicesterImage caption
The Briggs family had pushed for a reopening of the case more than 20 years after William's disappearance

In the years since, Mr Briggs' family had reason to believe the 23-year-old may have been the pawn in Rouse's plan, but had no way of proving it beyond doubt.

In 1930, factory worker Mr Briggs, who worked as a packer for Osram Lamps, had left the family home in Harlesden, north-west London, for a doctor's appointment but did not arrive at the surgery and was never seen again.

Crucially, he was of similar height and build to Rouse and, like the murderer, had auburn hair - a good fit for a man hoping to convince others he had died in a car fire.

Family keepsakes

Describing Mr Briggs' disappearance, Ms Hall said: "He was dressed in a plum suit and turned to wave his mum goodbye from the doorstep and but he was never seen again.

"Auburn hair was found at the crime scene, and a patch of plum cloth.

From a scientific perspective it is fantastic that we have been able to obtain DNA from a microscope slide over 80 years oldDr John Bond, Forensic science lecturer

"All of these stories have been passed down the generations and it's only recently I've been through the family keepsakes and found newspaper clippings and letters that my great-aunts had written, trying to reopen the murder case.

"Getting the answer to this would mean closure for my family."

Northamptonshire Police put the family in touch with the University of Leicester.

The team looked at the Rouse murder file, which contained the large wooden mallet he had used to first attack the victim, and a box of debris from the fire.

Tissue samples from the victim's prostate and lung had been extracted by Home Office pathologist Sir Bernard Spilsbury, whose entire work is held at the Royal London Hospital archive.

Profile of a murderer

Image copyrightDaily Mirror (1930)

Rouse had suffered a head wound in World War One, which left him with a personality disorder and was described as "a promiscuous rake with an enormous sexual appetite".

It is understood he fathered at least two illegitimate children and had child support orders imposed on him, leaving him with severe financial problems.

At the time, police believed he had probably picked up a homeless tramp, who would not be missed if he disappeared, and wanted the car fire to look as if he had died in a crash.

He placed the body in the driver's seat and left some of his own possessions inside before setting it on fire.

Rouse hoped the fire would go unnoticed in the early hours of the morning after Bonfire Night but two young men saw the flames and went to investigate.

The car's registration plate was still intact, identifying its owner Rouse, who had fled to Cardiff but was arrested and eventually tried for murder.

With the samples more than 80 years old, the team feared the tissues may have been contaminated with other people's DNA, or would be damaged when the glass side was removed.